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https://bugs.launchpad.net/bugs/2068119

Title:
  Mutter autopkgtests are failing if a GPU exists but is not accessible

Status in Mutter:
  Fix Released
Status in mutter package in Ubuntu:
  Fix Released
Status in mutter source package in Jammy:
  Fix Released

Bug description:
  [ Impact ]

  Mutter autopkgtests are failing if a GPU exists but is not accessible.
  Surprisingly this only just started becoming a problem recently:

  2730s # libmutter-MESSAGE: Running Mutter Test (using mutter 42.9) as a 
Wayland display server
  2730s libmutter-Message: 13:24:23.050: Running Mutter Test (using mutter 
42.9) as a Wayland display server
  2730s Bail out! libmutter-FATAL-WARNING: Failed to open gpu '/dev/dri/card0': 
Failed to open device '/dev/dri/renderD128': Permission denied
  2730s
  2730s (/usr/libexec/installed-tests/mutter-10/mutter-test-runner:6015): 
libmutter-WARNING **: 13:24:23.139: Failed to open gpu '/dev/dri/card0': Failed 
to open device '/dev/dri/renderD128': Permission denied

  
https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/arm64/m/mutter/20240604_132730_8ae4b@/log.gz
  
https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/arm64/m/mutter/20240604_160842_abf03@/log.gz

  I can also reproduce it on amd64 using a second user account that
  doesn't have access to /dev/dri/*

  Previous successful builds look like they worked only because there
  was no GPU to fail to open(?)

  [ Test case ]

  Autopkgtests must not fail when building for jammy-proposed

  [ Regression potential ]

  Mutter may fail to initialize on some GPU types.

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